linux-kernel - Re: [PATCH v3 5/7] mfd: cros_ec: Sync to the latest cros_ec

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Date:	Tue, 17 Jun 2014 10:20:36 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Paul Bolle <pebolle@...cali.nl>,
	Doug Anderson <dianders@...omium.org>
CC:	Bill Richardson <wfrichar@...omium.org>,
	Simon Glass <sjg@...omium.org>,
	Lee Jones <lee.jones@...aro.org>,
	Stephen Warren <swarren@...dia.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Andrew Bresticker <abrestic@...omium.org>,
	Dylan Reid <dgreid@...omium.org>,
	Olof Johansson <olof@...om.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 5/7] mfd: cros_ec: Sync to the latest cros_ec_commands.h
 from EC sources

On 06/17/2014 02:53 AM, Paul Bolle wrote:
> Doug,
> 
> On Fri, 2014-06-13 at 08:22 -0700, Doug Anderson wrote:
>> On Fri, Jun 13, 2014 at 1:08 AM, Paul Bolle <pebolle@...cali.nl> wrote:
>>> On Wed, 2014-06-11 at 08:11 -0700, Doug Anderson wrote:
>>>> This is a config option on the ChromeOS EC
>>>> <https://chromium.googlesource.com/chromiumos/platform/ec>.  Doing a
>>>> grep there:
>>>>
>>>> board/samus/board.h:#define CONFIG_CHARGER_PROFILE_OVERRIDE
>>>> common/charge_state_v2.c:#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE
>>>> common/charge_state_v2.c:#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE
>>>> common/charge_state_v2.c:#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE
>>>> driver/battery/samus.c:#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE
>>>> driver/battery/samus.c:#endif   /* CONFIG_CHARGER_PROFILE_OVERRIDE */
>>>> include/config.h:#undef CONFIG_CHARGER_PROFILE_OVERRIDE
>>>> include/ec_commands.h:  /* Range for CONFIG_CHARGER_PROFILE_OVERRIDE params */
>>>> test/test_config.h:#define CONFIG_CHARGER_PROFILE_OVERRIDE
>>>
>>> I see. So this is not a Kconfig macro but a general macro with a CONFIG_
>>> prefix. There are quite a bit of those in the tree already, but still,
>>> would another prefix also do?
>>
>> Given that it's an entirely separate project and this is a valid
>> CONFIG option in that project, it seems a lot to ask them not to use
>> the CONFIG_ prefix.  Also: the part you are objecting to is only a
>> comment, right?
> 
> So all the hits you quoted above are actually from code that's never
> going to be included in the kernel tree, right? If so, then yes, we're
> only discussing a single comment.
> 
>> We could certainly add extra wording in the comment to make it obvious
>> that this is a CONFIG option for the EC and not the kernel.  Would
>> that be enough?  ...or are you trying to use some scripts to
>> automatically process files to look for CONFIG options?
> 
> Yes, I'm using a script to check for Kconfig macros, among other things.
> It doesn't care about comments (because every now and then mistakes are
> made in comments too, and some of those can get surprisingly confusing).
> 
> Anyhow, the CONFIG_ prefix used in the kernel tree is quite generic, but
> we're stuck with it. Would it be bothersome to drop it in that comment?
> Mentioning a preprocessor macro from a separate project is a bit
> confusing to begin with. How is one supposed to know that this is a
> reference to something out of tree?
> 
> So, in summary, while we're apparently only discussing a single comment,
> I would appreciate it if it could be reworded, preferably by dropping
> that the CONFIG_ prefix. But other people might care very little, as
> they don't share this particular pet peeve.

Can't your tool maintain a whitelist or ignore list? There are many
cases where the kernel can pull in headers/data from other projects
(Firmware interfaces to an arbitrarily large set of HW, Device trees,
IO/network protocools, perhaps more). It feels quite unreasonable for
the kernel to decide that it exclusively owns the CONFIG_* namespace
even in comments, and that every other project it interacts with must
not use that namespace.
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